FBI Probes Leaks On Iran Cyberattack

WASHINGTON—The FBI has opened an investigation into who disclosed information about a classified U.S. cyberattack program aimed at Iran’s nuclear facilities, according to two people familiar with the probe.

The investigation follows publication last week of details of the cyber-sabotage program, including the use of a computer worm called Stuxnet, which Iran has acknowledged it found in its computers.

The Central Intelligence Agency ran the operation in conjunction with Idaho National Laboratory, the Israeli government and other U.S. agencies, according to people familiar with the efforts.

The New York Times on Friday published an account of the U.S. cyberattack operation in an excerpt from a forthcoming book by one of its reporters, David Sanger, that he said he has been working on for a year. Other news organizations, including The Wall Street Journal, followed up with details about the program.